Frequently used Tablespace and datafile commands

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Oracle database is divided into one are more logical storage unit called tablespace 

Tablespaces are divided into logical unit of storage called segments

Segments are divided into Extents

Extents are a collection of blocks

Tablespace Types:

  1. System tablespace
  2. Sysaux tablespace
  3. Temp tablespace
  4. Undo tablespace 

System tablespace

  •           System tablespace is first tablespace created at db creation
  •           It’s required all databases
  •           It’s containing data dictionary and the system rollback segments

Sysaux tablespace

  • Sysaux tablespace store the non-sys-related tables and indexes
  • It’s contains all performance related operations like awr,ash report generation

 

Temp tablespace

  • Temp tablespace are used to store the data with sorting operations
  • Can’t contain any permanent objects
  • Temp tbs need to create special type of keywords

EX:

          Create Temporary tablespace <tbs_name> TEMPFILE <location> size 100m;

Undo tablespace

  • Undo tablespace are used to store before image
  • Data can be used to undo transaction

         

TABLESPCE Views:-

DBA_TABLESPACE

V$TABLESPACE 

DATAFILE Views

DBA_DATA_FILES

V$DATAFILE

TEMP FILE Views

DBA_TEMP_FILES

V$TEMPFILE


Maximum Datafile size for SMALL File normal table space

DB Block Size

Maximum Data file Size

2k

4194303 *2k Block Size=8GB

4k

4194303 *4k Block Size=16GB

8k

4194303 *8k Block Size=32GB

16k

4194303 *16k Block Size=64GB

32k

4194303 *22k Block Size=128GB

 

Maximum Datafile size for BIG File normal table space

DB Block Size

Maximum Data file Size

2k

4194303 *2k Block Size=8 TB

4k

4194303 *4k Block Size=16 TB

8k

4194303 *8k Block Size=32 TB

16k

4194303 *16k Block Size=64 TB

32k

4194303 *22k Block Size=128 TB

  

Check BLOCK_SIZE


SQL> show parameter DB_BLOCK_SIZE;

 NAME                                         TYPE          VALUE

------------------------------------------------------------------

db_block_size                              integer         8192

 

Create Tablespace:-

SQL> Create tablespace JIO datafile'/u01/oracle/DEV/db/data/test01.dbf' size 100m;

(O/P) 

Tablespace created.

Create tablespace with Extra parameters:-

SQL> Create tablespace AIRTEL  datafile '/u01/oracle/DEV/db/data/test201.dbf' size 100m 

autoextend on

next 512k

maxsize 500m; 

(O/P)

Tablespace created.

 

Add new datafile :-

SQL> Alter tablespace JIO

          add datafile'/u01/oracle/JIO/db/data/test02.dbf'

          size 50m;

(O/P)

Tablespace altered.

How to Check datafile size

select file_name,sum(bytes)/1024/1024 from dba_data_files where tablespace_name='< tablespace_name >' group by file_name;

SELECT FILE#, STATUS, ENABLED, CHECKPOINT_CHANGE#, BYTES, CREATE_BYTES, NAME FROM V$DATAFILE;

Manually Resizing a Datafile

SQL> Alter database

     datafile '/u01/oracle/DEV/db/data/test02.dbf'

     resize 500m;

(O/P)

Database altered.

Rename Tablespace

SQL> Alter tablespace test2 rename to testdbf;

(O/P)

Tablespace altered.

Drop tablespace

SQL> DROP TABLESPACE TEST

INCLUDING CONTENTS AND DATAFILES; 

(O/P) 

Tablespace dropped.

Drop specific datafile from tablespace:-

SQL> Alter tablespace test

    drop datafile '/u01/oracle/DEV/db/data/test02.dbf';

(O/P)

Tablespace altered.

Assign user in particular tablespace:-

 SQL> create user HDFC identified by HDFC      

          default tablespace test;

(O/P)

User created.

Take tablespace Offline:-

 SQL> alter tablespace testtbs offline;

(O/P)

Tablespace altered.

Take tablespace ONLINE:-

 SQL>  alter tablespace testtbs online;

(O/P)

Tablespace altered.

Check datafile status online (or) offline

SQL> select file#,status from v$datafile;

How to check free and used space per tablespace:

 

SELECT /* + RULE */ df.tablespace_name "Tablespace",

df.bytes / (1024 * 1024) "Size (MB)",

SUM(fs.bytes) / (1024 * 1024) "Free (MB)",

Nvl(Round(SUM(fs.bytes) * 100 / df.bytes),1) "% Free",

Round((df.bytes - SUM(fs.bytes)) * 100 / df.bytes) "% Used"

FROM dba_free_space fs,

(SELECT tablespace_name,SUM(bytes) bytes

FROM dba_data_files

GROUP BY tablespace_name) df

WHERE fs.tablespace_name (+) = df.tablespace_name

GROUP BY df.tablespace_name,df.bytes

UNION ALL

SELECT /* + RULE */ df.tablespace_name tspace,

fs.bytes / (1024 * 1024),

SUM(df.bytes_free) / (1024 * 1024),

Nvl(Round((SUM(fs.bytes) - df.bytes_used) * 100 / fs.bytes), 1),

Round((SUM(fs.bytes) - df.bytes_free) * 100 / fs.bytes)

FROM dba_temp_files fs,

(SELECT tablespace_name,bytes_free,bytes_used

FROM v$temp_space_header

GROUP BY tablespace_name,bytes_free,bytes_used) df

WHERE fs.tablespace_name (+) = df.tablespace_name

GROUP BY df.tablespace_name,fs.bytes,df.bytes_free,df.bytes_used

ORDER BY 4 DESC;

 

 

 

 

Check free and used space particular tablespace:

 

SQL> select a. tablespace_name, 

sum(a.tots)/1024/1024 "Total Size (MB)", 

Sum(a.sumb)/1024/1024 "Total Free (MB)",

sum(a.sumb)*100/sum(a.tots) "% Free", 

Sum(a.tots-a.sumb)*100/sum(a.tots) "% Used", 

sum(a.largest)/1024/1024 "Max Free" 

From 

(

select tablespace_name, 0 tots, 

sum(bytes) sumb, max(bytes) largest 

From dba_free_space a 

group by tablespace_name 

union

select tablespace_name, sum(bytes) tots, 

0,0

from dba_data_files 

group by tablespace_name) a where a.tablespace_name = '&Tablespace_Name' 

group by a.tablespace_name;

Enter value for tablespace name:

old 22: where a.tablespace_name=&Tablespace_Name":

new 22: where a.tablespace_name =

 

 

SQL>set pages 999 lines 100

Col "Tablespace" for a50

Col "Size MB" for 999999999

Col "%Used" for 999

Col "Add (78%)" for 999999

select tsu.tablespace_name "Tablespace",

ceil(tsu.used_mb) "Size MB",

100-floor(tsf.free_mb/tsu.used_mb*100) "%Used",

ceil((tsu.used_mb - tsf.free_mb) / .78) - tsu.used_mb "Add (78%)"

from 

(select tablespace_name, 

sum(bytes)/1024/1024 used_mb

from dba_data_files 

group by tablespace_name) tsu, 

(select ts.tablespace_name,

nvl(sum(bytes)/1024/1024, 0) free_mb

from dba_tablespaces ts, dba_free_space fs

where ts.tablespace_name = fs.tablespace_name (+)

group by ts.tablespace_name) tsf

where tsu.tablespace_name = tsf.tablespace_name (+) and 100 - floor(tsf.free_mb/tsu.used_mb*100) >- 78

and tsf.tablespace_name='&TS'

order by 3,4


Enter value for ts:

old 14: and tsf.tablespace_name"&TS

new 14: and tsf.tablespace_name=

 

 

 

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